The document defines key terms related to disaster risk management including hazard, disaster, vulnerability, risk, elements at risk, capacity, response, relief, rehabilitation, reconstruction, mitigation, preparedness and prevention. It explains that hazard is a phenomenon with potential to cause disruption, disaster is a serious disruption exceeding the ability to cope, vulnerability reduces ability to withstand hazards, and risk is the probability of damage from a hazard given vulnerability and capacity. The document also distinguishes between recovery as restoring pre-disaster functioning, rehabilitation as assisting victims, and reconstruction as permanently repairing infrastructure.